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Income Taxes - MEC (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]        
Federal statutory income tax rate 21.00% 21.00% 21.00% 21.00%
Income tax credits 36.00% (31.00%) (165.00%) (29.00%)
State income tax, net of federal income tax impacts 0.00% (4.00%) (2.00%) 0.00%
Effects of ratemaking 5.00% (6.00%) (18.00%) (5.00%)
Other 0.00% 1.00% 3.00% 1.00%
Effective income tax rate 64.00% (21.00%) (178.00%) (13.00%)
Years eligible for federal renewable energy production tax credit     10 years  
Production tax credits     $ 1,414 $ 1,188
MEC        
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]        
Federal statutory income tax rate 21.00% 21.00% 21.00% 21.00%
Income tax credits (69.00%) (44.00%) (222.00%) (143.00%)
State income tax, net of federal income tax impacts (21.00%) (26.00%) (21.00%) (27.00%)
Effects of ratemaking (13.00%) (12.00%) (12.00%) (13.00%)
Other 3.00% 0.00% 1.00% 0.00%
Effective income tax rate (79.00%) (61.00%) (233.00%) (162.00%)
Years eligible for federal renewable energy production tax credit     10 years  
Production tax credits     $ 505 $ 400
MEC | BHE        
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]        
Related party transaction, cash received (paid) for income taxes     $ 757 $ 677